1) Consider this definition of software engineering given in lecture: "Software engineering is the process of building a set of related models that represent the system-to-be." List 3 examples of such models. 2) Choose three of the Informatics 43 Fundamental Principles of Software Engineering, and describe how each of them comes into play when creating a requirements specification 3) In Brooks' "No Silver Bullet," he names "changeability" as one part of the "irreducible essence of modern software systems." Explain what he means by changeability, and include an example, comparing software engineering to traditional engineering, to llustrate your explanation. 4) Draw and label a use case diagram for an online shopping site like amazon. Show at least 3 actors and at least 4 use cases. Write out a use case description of one of your use cases from the diagram. This description must include a basic flow, at least one exception flow, and at least one alternative flow